| (19) |
 |
|
(11) |
EP 4 468 709 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.02.2025 Bulletin 2025/07 |
| (43) |
Date of publication A2: |
|
27.11.2024 Bulletin 2024/48 |
| (22) |
Date of filing: 17.06.2020 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
| (30) |
Priority: |
17.06.2019 US 201962862674 P
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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20825992.9 / 3970376 |
| (71) |
Applicant: Beijing Dajia Internet Information
Technology Co., Ltd. |
|
Beijing 100085 (CN) |
|
| (72) |
Inventors: |
|
- CHEN, Yi-Wen
San Diego, California 92122 (US)
- XIU, Xiaoyu
San Diego, California 92130 (US)
- MA, Tsung-Chuan
San Diego, California 92122 (US)
- WANG, Xianglin
San Diego, California 92122 (US)
|
| (74) |
Representative: von Tietzen und Hennig, Nikolaus |
|
Lorenz Seidler Gossel
Rechtsanwälte Patentanwälte
Partnerschaft mbB
Widenmayerstraße 23
80538 München
80538 München (DE) |
|
| |
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| (54) |
METHODS AND APPARATUSES FOR DECODER-SIDE MOTION VECTOR REFINEMENT IN VIDEO CODING |
(57) A method for video encoding is provided. The method includes: partitioning a video
frame into multiple blocks; deriving an initial motion vector (MV) of a current block
in the multiple blocks; deriving cost values for the initial MV and each of MV candidates,
wherein the cost values are sums of absolute differences (SADs), and wherein a SAD
for a respective MV is calculated between reference blocks for the respective MV;
obtaining an updated cost value for the initial MV by decreasing a cost value for
the initial MV, wherein decreasing the cost value for the initial MV comprises decreasing
the cost value for the initial MV by a first value that is determined as 1/4 of the
cost value for the initial MV; and deriving a refined MV using the updated cost value
for the initial MV and the cost values for the MV candidates.